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United States Patent | 5,704,570 |
Irie ,   et al. | January 6, 1998 |
A nose type rail member for a crossing member applied to a turnout or wayside switch system on the ground for a train and the like, is made of high carbon steel material containing 0.70 to 0.82 wt. % of carbon. The rail member is constructed by a pair of rail parts, which have a concave at a side of the middle support part. A backing plate is made of the same material as the rail member, or a steel material having a less carbon content than that of the rail member, and is held by a pair of the opposite concaves. A pair of the head portions and the base portions at a side thereof are joined by means of electron beam welding, and the joined rail member is subjected to S.Q. heat processing; whereby at least a wheel tread of the rail member becomes a homogeneous and fine pearlite structure.
Inventors: | Irie; Takaaki (Himeji, JP); Takahata; Hisashi (Hyogo, JP) |
Assignee: | Yamato Kogyo Co., Ltd. (Hyogo, JP) |
Appl. No.: | 167094 |
Filed: | December 16, 1993 |
Dec 16, 1992[JP] | 4-355270 | |
Feb 01, 1993[JP] | 5-037526 |
Current U.S. Class: | 246/454; 238/148; 238/150; 238/164; 238/165; 246/415R; 246/460; 246/464; 246/472 |
Intern'l Class: | E01B 007/00 |
Field of Search: | 246/375,382,383,384,415 R,435 R,454,460,462,464,468,469,472 238/125,148,150,164,165 |
1774263 | Aug., 1930 | Gillispie | 246/464. |
1788622 | Jan., 1931 | Gillispie | 246/435. |
1794287 | Feb., 1931 | Germann | 246/468. |
2174367 | Sep., 1939 | Hoffman | 246/468. |
4575397 | Mar., 1986 | Heller | 238/150. |
Foreign Patent Documents | |||
1049890 | Feb., 1959 | DE | 238/165. |
63-65735 | Dec., 1988 | JP. | |
1-197903 | Aug., 1989 | JP. |